First shot--car's front bumper is far too close to the edge of the frame; a vehicle shown in motion almost always looks better when there is "obviously MORE space" in front of the car than there is behind it...not always, but "almost always".
The light on these is not the best...the driver's side is in shadow and the front bumper is also in shadow...that is always a problem when shooting black autos on days like that when the sky is light and kind of overcast or even partly-cloudy; the roof and the hood reflect the mostly-overhead light, and leave the under-parts and sides of the car MUCH darker...the hood and top often reflect the bald,ugly sky...that is always the big issue with cars----cars reflect the light SOURCE, and they do it in a big,big,big way!!!! The tires in these kind of disappear into total blackness on my monitor. I DO LIKE the panning/shutter speed you used in shot #1 though! You know, the biggest problem with these kinds of photos is that the professional ones are so damned GOOD, and the amateur and enthusiast rolling shots are usually not exceptionally good...because the pro shots are often done with a 5-man crew run by a very experienced, smart, commercial shooter who specializes in shooting cars and who happens to be working with a $50,000 budget, a great location, and lighting/weather conditions that are as close to ideal as he can possibly manage...ya know what I mean???